WHAT IS EOZOON f 



67 



manner, and with very thin walls unprotected by sup- 

 plemental skeleton. Then the growth was arrested, 

 and possibly these upper layers gave off reproductive 

 germs, fitted to float or swim away and to establish 

 new colonies. We may have such reproductive germs 

 in certain curious globular bodies, like loose cells, found 

 in connection with irregular Eozoon in one of the 

 Laurentian limestones at Long Lake and elsewhere. 



FIG. 18. Minute Foraminiferal forms from the Laurentian of Long 

 Lake. 



Highly magnified, (a.) Single cell, showing tubulated wall, (b, c.) Portions of 

 same more highly magnified. (<J.) Serpentine cast of a sjLmilar chamber, 

 decalcified, and showing casts of tubuli. 



These curious organisms I observed some years ago, 

 but no description of them was published at the time, 

 as I hoped to obtain better examples. I now figure 

 some of them, and give their description in a note. 

 (Fig. 18). I have recently obtained numerous additional 



